Abstract

Overview

This research explores passive techniques specifically designed for magnetic field mitigation in the 69/115 kV underground power system installed by the Metropolitan Electricity Authority (MEA). The study leverages the Finite Element Method Magnetics (FEMM) program for design and simulation.

Findings

• Various passive techniques have been discussed: conductive loop, conductive shield, and ferromagnetic shield.
• A comparative analysis showcases the effectiveness of these techniques in reducing magnetic fields below established safety thresholds by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and European standards.

Conclusion

The paper demonstrates that all proposed passive techniques are capable of reducing the magnetic field intensity to levels safer than 10 μT. Among the techniques, conductive and ferromagnetic shields are more effective than the conductive loop. However, ferromagnetic shields, despite their higher efficacy, display a potential for high failure rates due to material fragility.